Otimização das condições de refrigeração / lubrificação no processo de retificação cilíndrica de mergulho
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Data
2004-10
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Universidade Estadual Paulista (Unesp)
Resumo
Diante do elevado desenvolvimento tecnológico mundial, o processo de retificação surge cada vez mais como um dos processos de usinagem mais importantes dentro das indústrias. Diante disto, na procura incessante por processos mais capazes e econômicos é que as empresas vêm buscando a otimização da retificação, por exemplo, através da redução da quantidade de fluido de corte a ser utilizada. Desta forma este projeto pretendeu explorar o conceito da utilização racional de fluidos de corte no processo de retificação, e a utilização de defletores aerodinâmicos para minimizar os efeitos das camadas de ar provindas da rotação do rebolo. Foram utilizados dois fluidos de corte (uma solução sintética e um óleo emulsionável), duas ferramentas abrasivas (um rebolo convencional e outro superabrasivo de CBN com ligante vitrificado), um bocal convencional (para o sistema de lubri-refrigeração convencional) e um bocal otimizado de formato arredondado (para o sistema otimizado, que conta ainda com o emprego ou não dos sistemas defletores). Nas condições de aplicação otimizada, fez-se quatro variações da velocidade de saída do fluido, partindo-se de uma relação unitária (velocidade de saída do fluido de corte igual à velocidade de corte do rebolo), tentando verificar se uma velocidade de fluido um pouco menor poderia afetar negativamente às variáveis de saída analisadas (força tangencial de corte, energia específica de retificação, emissão acústica, rugosidade, desgaste diametral, circularidade, tensão residual e microscopia eletrônica de varredura), com o intuito de se buscar a mínima quantidade de fluido de corte possível de ser aplicada sem prejudicar o processo e a qualidade final das peças. Os resultados mostraram a eficiência na utilização dos defletores aerodinâmicos na condição otimizada, os quais para todas... .
Given the high world technological development, the grinding process appears like one of the most important processes inside the industries. Thus, companies are looking for the optmization of the grinding process, for example, through the reduction of the amount of cutting fluid used as the incessant search for more capable and economical processes takes place. Therefore, this project intended to explore the concept of the rational use of cutting fluids in the grinding process, and the utilization of the aerodynamics deflectors to minimize the effects of the air layers created by the grinding wheel rotation. Two cutting fluids (a synthetic cutting fluid and an emulsion oil), two grinding wheels (a conventional and other CBN superabrasive grinding wheel with vitrified bond), a conventional nozzle (for the conventional system of coolant and lubrication) and an optimized nozzle with round format (that was used with and without the deflector system) were used. For conditions of optimized coolant and lubrication, four variations of the coolant jet speed were developed, starting from the unitary relationship (coolant jet speed equal to the wheel peripheral speed), trying to verify whether a minor coolant jet speed could affect negatively the output variables (tangential cutting force, grinding specific energy, acoustic emission, roughness, diametrical wear of grinding wheel, roundness, residual stress and scanning electron microscopy), with the intention of looking for the minimal quantity of cutting fluid that can be applied without harming the process and the final quality of the workpieces. The results showed the efficiency of the aerodynamic deflectors in the optimized coolant/lubrication for all the machining conditions. In relation to the different coolant jet speeds used, it has been noticed that the tendency was to improve the final... (Complete abstract, click electronic address below).
Given the high world technological development, the grinding process appears like one of the most important processes inside the industries. Thus, companies are looking for the optmization of the grinding process, for example, through the reduction of the amount of cutting fluid used as the incessant search for more capable and economical processes takes place. Therefore, this project intended to explore the concept of the rational use of cutting fluids in the grinding process, and the utilization of the aerodynamics deflectors to minimize the effects of the air layers created by the grinding wheel rotation. Two cutting fluids (a synthetic cutting fluid and an emulsion oil), two grinding wheels (a conventional and other CBN superabrasive grinding wheel with vitrified bond), a conventional nozzle (for the conventional system of coolant and lubrication) and an optimized nozzle with round format (that was used with and without the deflector system) were used. For conditions of optimized coolant and lubrication, four variations of the coolant jet speed were developed, starting from the unitary relationship (coolant jet speed equal to the wheel peripheral speed), trying to verify whether a minor coolant jet speed could affect negatively the output variables (tangential cutting force, grinding specific energy, acoustic emission, roughness, diametrical wear of grinding wheel, roundness, residual stress and scanning electron microscopy), with the intention of looking for the minimal quantity of cutting fluid that can be applied without harming the process and the final quality of the workpieces. The results showed the efficiency of the aerodynamic deflectors in the optimized coolant/lubrication for all the machining conditions. In relation to the different coolant jet speeds used, it has been noticed that the tendency was to improve the final... (Complete abstract, click electronic address below).
Descrição
Palavras-chave
Retificação - Teses, Fluidos de corte, Deflectors, Cutting fluid
Como citar
CATAI, Rodrigo Eduardo. Otimização das condições de refrigeração / lubrificação no processo de retificação cilíndrica de mergulho. 2004. 178 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Engenharia de Guaratinguetá, 2004.